| 摘要 |
A steering system for a tracked machine having dual power paths to opposed planetary differential gear sets for providing conventional differential steering and a second method of steering where the speed of one track is reduced while keeping the other track at its initial speed. The steering system includes primary and secondary drive inputs into the opposed planetary gear sets. The planetary gear sets combine the rotations from the primary and secondary drive inputs in a first steering mode for increasing the speed of one track while reducing the speed of the other track by an equal amount. A second mode of steering is also possible where the speed of one track is reduced while keeping the other track at its initial speed for larger turning radii. The primary drive input includes a variable displacement fluid pump and a variable displacement motor connected to the planetary gear sets by means of a drive shaft for driving the tracks of the machine. The secondary drive input includes a reversible fluid motor connected to a differential gear assembly with opposed drive shafts and steering mode clutches being connected between the differential gear assembly and planetary gear sets for controlling the steering mode.
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